Hi [mention removed],
Unreal Engine is undergoing several changes in version 5.6, one of which involves a transition toward a Left-Up-Forward (LUF) coordinate system. As part of this shift, some viewport behaviors, like the orthographic view orientation you mentioned are starting to reflect this new system.
Tim Sweeney(Epic CEO) provided more context about this change here: https://x.com/TimSweeneyEpic/status/1930678660098408669
This change is part of Epic’s roadmap, the goal is to align Unreal Engine with more standard 3D conventions. Epic has started introducing helper C++ functions to ease the transition.
If needed, I can reach out to Epic to check whether there’s any way to customize or override the new axis behavior in the editor views. That said, since this change will affect future engine versions as well, I’d recommend beginning to adapt to the new orientation as there might be more systems being affected by this change.
Best,
Joan